Line a 9 x 13 inch baking dish with parchment paper or lightly coat with cooking spray.
Cream sugars, butter and peanut butter together in a large mixing bowl.
Beat in the eggs and vanilla just until combined.
In a small bowl, combine the flour, baking powder and salt.
Stir the flour mixture into the creamed mixture just until combined. Do not over mix.
Stir in the peanut butter and chocolate chips.
Spread dough into the prepared baking dish and bake for 28-33 minutes or until an inserted toothpick comes out with a few moist crumbs. Let cool before cutting into squares.
Notes
Storage: You can store these peanut butter chocolate chip brownies in an airtight container for up to 4 days.
Freezer: Once you bake your brownies, let them cool completely, then wrap them tightly in plastic wrap and place them in a freezer-safe bag or container. You can store them for about 2-3 months.
Make Ahead: To make these brownies ahead of time, combine all of your ingredients to make your batter, then wrap your pan tightly with plastic wrap and place it in the freezer. When you're ready to bake, bring the pan to room temperature.